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High Pressure Raman Study of the Hydrolysis Reaction of Tmos and Teos

Published online by Cambridge University Press:  28 February 2011

G. Hoang ,
J. Watson  and
T. W. Zerda
G. Hoang
Affiliation:
Physics Department, Texas Christian University, Fort Worth, TX 76129
J. Watson
Affiliation:
Physics Department, Texas Christian University, Fort Worth, TX 76129
T. W. Zerda
Affiliation:
Physics Department, Texas Christian University, Fort Worth, TX 76129
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Abstract

High pressure Raman spectroscopy is used to monitor the hydrolysis reaction of TMOS in solutions with methanol, acetonitrile, acetone, dioxane and formamide, and of TEOS as a function of pH and the catalyst used. The rate constants for various solvents, temperatures and pressures are experimentally determined from the time dependence of Raman band intensities. It is shown that the reaction is slow in dioxane and fast in methanol or formamide. The volume of activation is found from the pressure dependence of the rate constant. The volume of activation, the dielectric constant, dipole moments and hydrogen bonding properties and their role in the hydrolysis reaction are discussed. It is shown that solvents which can form hydrogen bonding with Si-OR groups can increase the rate of the reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 15
Copyright
Copyright © Materials Research Society 1990

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References

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